Method of rolling black plates or sheets.



' mtreonrs JAMES It. returns AND CIIARLE w. BRAY, or ri'rrsnui-zo, Pussies STATES v YANIA, ASSIGNURS TO 'llll-I AMERICAN TIN' PLATE COMPANY, OF ORANGE, NEW JERSEY l C-OR-PORATIQN OF NEW JERSEY.

METHOD OF ROLLl'NG BLACK PLATES R SHEETS.

SPECIFICATION forming part of Lettezs Patent No. 740,176. dated; September 29, 1903. A lication filed December 23,1901; Serial No. 36,932. (No modem Be it known that ire, JAM ES R. PH-ILLIIS and CHARLES BIL-\Y, of Pittsburg, Allegheny county. Pennsylvania, have invented a new.

' and useful )lethod of Rolliuglllnck Plates or Sheets, of which the following is a full, clear, and exact. description.

Our invention relates to the rolling of thin sheets or plates from bars, and especially the to rolling of black sheets for tinning; and its objcct is to prevent sticking of the sheets of a pack together and do away withtho numerous beatings and opening of the packs heretot'ore necessary. In the method now used :5 {or producing such sheets four heatings and two doublings have becnnecessary in reducing sheet-bars to sheets of the desired gage. It has heretofore been found impracticable to continue the rolling of a pack beyond a cerao. tsi'nsmount, for the reason that if continued beyond this limit the different layers of the pack will stick together. Consequently the rolling must be stopped, the sheets opened, the packs reformed and rcheatedmnd the roll- :5 ing then continued.

Our invention consists in coating the plates or sheets of a pack with copper by dipping them in a snltutc-o i-copper solution and then making a pack of the coated plates and rollingz to the desired gage.

It further consists in the combinations of steps, as hereinafter more fully described, and set forth in the claims.

Incarryiug out our process in its preferred form we use sheet-bars of aboi-itone-sixteenth of an inch in thickness in place of the ordinary bars, which are from three-eighths of an inch to one-half inch thick, though the regular bars may be used, if desired. These sheetbars are of a width suitable tornake a sheet of the width desiredimd of such a length as to make sheets of the desired thickness when rolled tothe proper length. These sheet bars (01' plates are coated with copper by passing 5 them through a'solntion of sulfate of copper.

They are then heated in the usualmsnncq.

formed into a psckot six or eight or any desired number, and this pack is rolled until double this pack before heatin the desired gage of shectsis obtained. "We may pickle the bars in a dilute solution of sulfuric or other acid in order to remove the scale before subjecting them to the coating solution, the plates then being Washed before they are coated. This would tendto give a more even distribution of the coating over the plate; but we have not found the step of pickling to be necessary, having carried out the operation by merely subjecting plates to the sulfate-ofcopper solution and then heating and rolling them in the pack.

' In operatingour process the plates may be piled or matched upon each other to form a pack after heating; but for convenience in keeping the plates together in the furnace we preferably pile three or more of the plates upon each other after coating them and then This doublingbinds the plates closely together. so that they will remain as a compact 'pack'in the fur- "nuce and will also keep them in proper-position for handliugduring rolling.

The process may be further vsriedhy coating the plates, heating them, forming a paeli of three or more of the heated plates or bars and then doubling the pack and rolling it t the desired gage. The sulfate-ot'-coppcr solir tion which we have used has been from thirty to fifty per cent. solution; but. a weak-er o1 stronger solution might be used, and we dt notwish to limit ourselves to any particula:

' strength or percentage in the coating-both The advantages of our invention result iron the great reduction in the amount of lobe: and time required in rolling plates into sheets The bars or plates may be reduced'to the de sired gage for tin plates or otherwise at a sin gle heatwithout opening the-pack and reheat ing. The coating in this particular bath i: found to eliectna-lly prevent sticking oft-hi plates or sheets together and does not inter fore with the'tinuing operation to which tht sheets are afterward subjected. The ooatiu; may he applied by electrodeposition or other wise, and many variations may he made ii the apparatus used and the succession of step without departing from our invention, sine we consider ourselves the first to coat plates I $heeiS,cOu s1slI ng if; pickling said plzstgspoa. prbars'wizh copper before forming a pack in; themwith asoluliou of sulfate ofooppea and rolling. farming 5; pack and heating and rolling th We claim-*- pack to the desired gage; substantialiy a 5 I. The method of telling sheets or plate described.

cousisLing in coating bars or plates with cop- In testimony wherecf we have hereunto 3e per, forming a pack-of the coated plates and our, hands. rolling them to the desired gageysubstan JAMES R. PHILLIPS. tiallyas described; C. V. BRA. m 2; The method of rolling sheets or plates, \Vi-tneases as to James R. Phi-Hips:

consisting in coating pbues with a snlfatenf W. 'I. GRAHAM,

coppersoiut'zon, formiuga pack of snid'plates, R. 11.153103. and then heating and rolting the pack to the Witnesses as to Charles W. Bray: desired gage; substantially as described. C. P. BYRNES,

:5 3. The method of rolling black piates or G20. 15. Bnmuxm 

